Before the change
Copy existing DNS records, confirm the hosting IP address, MX records and TXT records for SPF, DKIM and DMARC.
If the old zone had custom records, move them before changing delegation.
After the change
Monitor the website and e-mail, check propagation and do not remove the old configuration immediately after the change.
With Hostilla.pl you can manage domain, e-mail, SSL and DNS in one environment.